In　the　development　of　new　electrochemical　concepts　for　the　fabrication　of　high-energy-density　batteries,　fluoride-ion　batteries　(FIBs)　have　emerged　as　one　of　the　valid　candidates　for　the　next　generation　electrochemical　energy　storage　technologies,　showing　the　potential　to　match　or　even　surpass　the　current　lithium-ion　batteries　(LIBs)　in　terms　of　energy　density,　safety　without　dendritic　grains,　and　elimination　of　dependence　on　scarce　lithium　and　cobalt　resources.　However,　the　development　of　FIBs　is　still　in　its　infancy　and　their　performance　is　far　from　satisfactory,　with　issues　such　as　the　lower　fluoride-ion　conductivity　of　the　electrolytes　and　the　reversibility　of　the　electrodes　hindering　their　commercialization.　Previous　reviews　have　mainly　focused　on　inorganic　solid　electrolytes　with　a　brief　emphasis　on　the　development　of　various　fluoride-ion　conductors　and　their　ion-conducting　properties.　Therefore,　this　review　summarizes　the　current　developments　in　various　electrolytes,　a　systematic　overview　of　the　current　progress　for　various　fluoride-ion　electrolytes　is　presented　by　beginning　with　the　history,　structure　and　classification　of　FIBs,　ion-transport　mechanisms　are　briefly　discussed.　Recent　advances　in　different　classes　of　fluoride-ion　electrolytes　are　described.　The　methods　for　optimizing　the　ionic　conductivity　characteristics　of　the　fluoride-ion　electrolytes　are　highlighted.　Finally,　an　outlook　on　the　future　research　direction　of　FIBs　is　given　by　highlighting　some　critical　issues,　challenges　and　prospects　of　fluoride-ion　electrolytes.　©　2024　The　Authors